Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba529f81c5e21303…

MALICIOUS

PDF

70.1 KB Created: 2021-09-24 14:45:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 8cceb0df0b80e8d551e35aa5613d18f2 SHA-1: dafd00efc5c09956eb2ef9f7733645d8561d361c SHA-256: ba529f81c5e213031e465db5ca44847d7852d1aa130e2da928fab1822a7f888a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farm characteristics points to a tactic of luring users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://cructi.ru/uplcv?utm_term=how+to+find+out+if+your+phone+is+rooted PDF link annotation
    • https://bokaichenyu.com/upload/files/61607032846.pdfIn PDF document text
    • http://373113.linker.tw/files/32402594836.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/20750926580.pdfIn PDF document text
    • https://ntct-dz.com/ckfinder/userfiles/files/42749204251.pdfIn PDF document text
    • http://tehpromyar.ru/media/file/65963788194.pdfIn PDF document text
    • https://mimpiindah88.com/contents/files/90141494491.pdfIn PDF document text
    • http://betonkeritesek.eu/Content/files/mejojepipiton.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/kexivef.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/xovonufafizusanewatilaboz.pdfIn PDF document text
    • http://www.papelerialapiceros.es/ckfinder/userfiles/files/43275419904.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/250c98a8c8f0e47bc5c2a05258ddfae9/kunafog.pdfIn PDF document text
    • https://penmypoem.com/new/admin/uploadfiles/file/81016981378.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/niwovim.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/46aea3b4f294da4a8b4d08b085bba59f/28446672402.pdfIn PDF document text
    • http://wimborst-ceramics.nl/ckeditor/ckfinder/userfiles/files/90316547928.pdfIn PDF document text
    • http://abwnickersonplaza.com/uploads/files/82238209771.pdfIn PDF document text
    • http://rebeccaosborne.com/uploads/xiboga.pdfIn PDF document text
    • http://vswet.ru/f/xawawoze.pdfIn PDF document text
    • http://prefinancovaniehypoteky.sk/res/file/xuxekevokaguso.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/bivufixaxu.pdfIn PDF document text
    • http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/jagafoxepe.pdfIn PDF document text
    • http://thenikharvconsultancy.com/userfiles/file/sifurulonixezus.pdfIn PDF document text
    • http://studioguagnoni.it/userfiles/files/jovegidita.pdfIn PDF document text
    • http://szm.hu/userfiles/file/vojuxexidejak.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f594774234a1db0ca2f5127497e5647c/83966577376.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/42431266933.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB175 10676 bytes
SHA-256: ab1786ce34e67839d8cfb45a3575a1a43bfeea07b5f21ccf576d24a920181964
font_01_sfnt_off0000c9e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E4 15948 bytes
SHA-256: 6dfb6ab3aca3734efce9d542ee2185bfcdfaaf228a2885276572057088415209
font_02_sfnt_off0000f2b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1